JP4280905B2 - Slag carry-out conveyor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a slag carry-out conveyor for carrying out granulated slag from a water tank that rapidly cools and solidifies flowing molten slag to form granular granulated slag.
[0002]
[Prior art]
For example, incineration residues composed of fly ash and incineration ash are preferably melted and solidified in order to reduce, stabilize, and effectively utilize due to the recent tightness of landfills. In this case, the molten slag flowing out from the ash melting furnace is dropped into the water tank and rapidly cooled to form granular granulated slag, which is then scraped from the water tank by the slag carry-out conveyor.
[0003]
The water tank has a structure having an inclined portion whose bottom surface is gradually shallower from the deepest portion toward the water surface position.
[0004]
The slag carry-out conveyor is configured to include an endless chain (endless driving means) that is swiveled and a plurality of scrapers provided on the outer periphery of the endless chain, and has moved downward due to the swiveling of the endless chain. When the scraper moves along the bottom surface, the granulated slag descending to the bottom surface is scraped out of the water tank through the inclined portion.
[0005]
In addition, as the scraper, a plate-shaped one or an L-shaped one having an improved strength is used.
[0006]
[Problems to be solved by the invention]
However, in the slag carry-out conveyor, even when a scraper having an L-shaped cross section is used, for example, there is a risk of bending deformation during the scraping operation of the granulated slag, and in addition, in the valley portion of the L-shaped cross section in the scraper. There was a problem that granular granulated slag tends to accumulate.
[0007]
The present invention has been made in view of the above circumstances, and has as its object to provide a slag carry-out conveyor that has sufficient strength against scraping of granulated slag and that does not cause accumulation of granulated slag. Yes.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 is provided with an endless driving means that swivels and moves along a circular orbit, and a plurality of scrapers provided on the outer peripheral portion of the endless driving means. By sequentially moving each scraper in the shallow direction of the inclined portion along the bottom surface having an inclined portion where the water depth gradually changes in a water tank that is rapidly cooled to form a granulated slag, the granulated slag that has fallen to the bottom surface is removed. A slag carry-out conveyor configured to be scraped out of the water tank, wherein the scraper includes a foundation blade connected to an outer peripheral portion of the endless drive means, and the endless drive from a front edge of the foundation blade in the moving direction. Projecting outward with respect to the means, and when the endless drive means moves downward along the bottom surface as the endless drive means turns. A scraping blade having an outward projecting edge contacting the surface, a rear edge in a direction opposite to the moving direction of the foundation blade and an inclined plate connected to the outward projecting edge of the scraping blade. And the water tank includes a supply port for supplying cooling water for rapidly cooling the molten slag, an overflow portion for determining the height of the water surface by overflowing the cooling water, and an upper portion above the overflow portion. And a cover for preventing the granulated slag from dropping at the overflow portion .
[0009]
According to a second aspect of the present invention, in the first aspect of the invention, the endless drive means is configured in a ring shape by connecting both end portions of a plurality of links rotatably via pins. provided become endless chain pair of the said scraper, the basal blade and the scooping blade is integrally formed by angle irons Rutotomoni, basal blade the inclined plate is formed by a flat bar Connected to the outer surface of the rear edge and the rear surface of the outwardly projecting edge of the scraping blade by welding , and a plurality of them in the swivel movement direction so as to span between the pair of endless chains. It is provided and each is fixed to the link .
[0010]
In the first and second aspects of the present invention, when the scrapers are sequentially moved downward by the swiveling movement, the outward projecting edge of the scraping blade slides on the bottom surface. The entire granulated slag moves together with each scraper and is scraped out of the water tank outside the bottom surface via the inclined portion.
[0011]
At the time of scraping, the scraper receives external forces such as a compressive load, a tensile load, and a bending load due to the movement resistance of the granulated slag and the sliding resistance with the bottom surface. However, the scraper is formed in an L-shaped cross section by the foundation blade and the scraping blade, and the rear edge of the foundation blade and the outward protruding edge of the scraping blade are connected by an inclined plate to form a triangular cylinder shape. Therefore, the second moment of section is extremely large. For this reason, sufficient strength is provided for the bending load, which is a burden on the scraper. Therefore, it is possible to prevent the scraper from undergoing deformation such as bending due to the scraping operation of the granulated slag.
[0012]
On the other hand, each scraper may be in a state of being positioned above the bottom surface due to the turning movement. In this case, coarse slag may hit the scraper. That is, the molten slag solidifies on the side wall surrounding it and becomes coarse slag, and the coarse slag may fall into the water tank and hit the scraper. Since the moment is extremely large, it is possible to prevent the scraper from being bent and deformed.
[0013]
Also, when each scraper moves upward with respect to the bottom surface, the outer surface of the foundation blade faces upward, but the rear edge of the foundation blade and the outward protruding edge of the scraping blade are inclined. Since they are connected by the plates, it is possible to prevent the granulated slag descending underwater from accumulating on the scraper.
[0014]
In the invention according to claim 2, the foundation blade and the scraping blade are integrally formed of angle steel, the inclined plate is formed of flat steel, and the outer surface of the rear edge of the foundation blade and the scraping blade Since it is connected to the rear surface of the outwardly protruding edge portion of the steel plate by welding, a scraper having excellent durability can be obtained.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below with reference to the drawings.
[0016]
As shown in FIG. 5, the slag carry-out conveyor 7 shown in this embodiment melts fly ash, incineration ash, etc. (hereinafter referred to as “incineration residue”) A in the melting furnace 1 and drops it from the melting furnace 1 ( The granulated slag C (see FIG. 2) after the molten slag B flowing down) is rapidly solidified by cooling water (water) W in the water tank 6 and pulverized into granules is carried out of the water tank 6. .
[0017]
As shown in FIG. 5, the melting furnace 1 melts a melting furnace main body 11, a hopper 12 provided adjacent to the melting furnace main body 11, and an incineration residue A introduced into the hopper 12. The pusher 13 is pushed out into the furnace main body 11 and a burner 14 is used to heat the inside of the melting furnace main body 11. The molten slag B generated in the melting furnace main body 11 is discharged through the discharge port 11a. Then, it flows out into the water tank 6.
[0018]
Further, the melting furnace 1 supplies the thermite agent together with the incineration residue A to efficiently melt the incineration residue A using the reaction heat of the thermite agent.
The thermite agent combusts powdered red mud (iron oxide-containing waste) and aluminum dross (aluminum-containing waste) so that the molar ratio of the iron oxide component to the aluminum component is 1: 2. Consists of things packed in sex bags.
When such a thermite agent is used, there is an advantage that the incineration residue A can be efficiently melted as described above, and waste such as red mud and aluminum dross can be treated at the same time. There are advantages.
[0019]
The water tank 6 includes an overflow part 61 that maintains the water surface Wa at a predetermined level by causing the cooling water W to overflow, a slag discharge part 62 positioned above the overflow part 61, an overflow part 61, and a slag discharge part 62. A bottom plate 63 disposed between the side plate 66, a side plate 66 disposed on the side of the bottom surface 63, a first end plate 661 disposed at an end of the overflow unit 61, and a slag discharge unit 62 side. A second end plate portion 662 provided at the end portion and an upper plate portion 67 disposed above the bottom surface 63 and the like are provided.
[0020]
The bottom surface 63 includes a horizontal portion 63a positioned below an opening 67a described later, a first inclined portion 63b inclined downward from the overflow portion 61 toward the horizontal portion 63a, and a slag discharge portion 62 from the horizontal portion 63a. And a second inclined portion (inclined portion) 63c inclined upward. The connecting portion between the horizontal portion 63a and the first inclined portion 63b and the connecting portion between the horizontal portion 63a and the second inclined portion 63c are formed by smoothly curved surfaces.
[0021]
The upper plate portion 67 is provided with an opening 67 a for receiving the dripping molten slag B at a position directly above the horizontal portion 63 a on the bottom surface 63. Further, a supply port 67b for the cooling water W is provided in the vicinity of the opening 67a. And the low temperature cooling water W is supplied from the supply port 67b, and the amount of the cooling water W according to this supply amount flows out from the overflow part 61, so that the temperature of the cooling water in the water tank body 6 is within a predetermined range. To be controlled.
[0022]
As shown in FIG. 1, the overflow portion 61 is formed in a concave shape as a whole, and a drain port 61 a for discharging the overflowing cooling water W is provided at the bottom of the overflow unit 61, and the drain port 61 a A drainage pipe 81 that communicates with the pipe is directed downward. Further, as shown in FIGS. 1 and 4, a drain pipe 83 having a funnel portion 82 for receiving the cooling water W flowing out from the drain pipe 81 is installed below the drain pipe 81. The funnel portion 82 is provided with a filter 84 that prevents the granulated slag C from flowing out to the drain pipe 83.
[0023]
As shown in FIG. 5, the slag carry-out conveyor 7 includes a first sprocket (first support wheel) 71 disposed above the overflow portion 61 and a second sprocket disposed above the slag discharge portion 62. (Second support wheel) 72, endless chain (endless driving means) 73 wound around first sprocket 71 and second sprocket 72, and a plurality of scrapers provided on the outer periphery of endless chain 73 74 (see FIGS. 1 to 3).
[0024]
The first sprocket 71 is composed of a pair of ones arranged on the first shaft 71a with a predetermined interval in the axial direction. Similarly, the second sprocket 72 is constituted by a pair of ones arranged on the second shaft 72a at the same interval as the first sprocket 71. Further, the second shaft 72a is a drive shaft, and the first shaft 71a is a driven shaft.
[0025]
The endless chain 73 includes a pair of ones wound around one first sprocket 71 and the second sprocket 72 and a pair wound around the other first sprocket 71 and the second sprocket 72. Consists of things.
Moreover, the endless chain 73 is comprised by the cyclic | annular form by connecting the both ends of each link 73a rotatably via the pin 73b, as shown in FIGS. 1-3.
[0026]
The scraper 74 is connected to the base blade 74a connected to the outer peripheral portion of the endless chain 73, and when the endless chain 73 moves downward along the bottom surface 63 (see FIG. 2), the front edge 74d in the moving direction D of the base blade 74a. A scraping blade 74b having an outward projecting edge 74e projecting outward from the endless chain 73 from the endless chain 73 (see FIG. 3), and a rear edge 74f in the direction opposite to the moving direction D of the base blade 74a ( 3) and an inclined plate 74c connected to the outer surface 74g (see FIG. 3) and the rear surface 74h (see FIG. 3) of the outward projecting edge 74e of the scraping blade 74b.
[0027]
The foundation blade 74a and the scraping blade 74b are integrally formed of angle steels orthogonal to each other in an L shape. The inclined plate 74c is made of flat steel and is connected to the outer surface 74g of the rear edge 74f of the foundation blade 74a and the rear surface 74h of the outer protruding edge 74e of the scraping blade 74b by welding. .
That is, the scraper 74 is formed of a cylinder whose cross section is a right triangle. Moreover, as said angle iron, it is possible to use, for example, an equilateral angle steel or an unequal angle iron.
[0028]
The scraper 74 is provided at a predetermined interval in the movement direction D so as to span the links 73a arranged in parallel. In this case, the scraper 74 is provided so as to protrude to the outer side of the endless chain 73 configured in an annular shape, and the front surface of the scraping blade 74b is directed to each link 73a with the moving direction D of the endless chain 73 directed. It is fixed.
[0029]
On the other hand, as shown in FIG. 1, an inclined cover 68 is provided above the overflow portion 61, at least below the movement range of the endless chain 73 and the scraper 74, so that the first inclined portion 63 b side is downward. It has been. That is, in the inclined cover 68, the left and right side edges reach the left and right side plates 66, the upper edge reaches the first end plate 661, and the lower edge reaches a predetermined upper portion of the first inclined portion 63b. It is formed so as to overlap with an interval.
[0030]
In the water tank 6 and the slag carry-out conveyor 7 configured as described above, when the molten slag B is dropped from the discharge port 11a into the cooling water W through the opening 67a, the molten slag B is rapidly cooled and solidified. The granulated granulated slag C and the granulated slag C are deposited on the bottom surface 63 such as the horizontal portion 63a through the endless chain 73 and the scraper 74 that move in the upper part and the lower part below the water surface Wa. It will be. At this time, as shown in FIG. 3, for example, the granulated slag C falls on the scraper 74 located above, but the outer surface 74g of the foundation blade 74a is covered with the swash plate 74c. It is possible to prevent the granulated slag C from accumulating on the scraper 74.
[0031]
That is, when each scraper 74 moves upward with respect to the bottom surface 63, the outer surface 74g of the foundation blade 74a faces upward. However, the scraper 74 faces the outer surface 74g of the rear edge 74f of the foundation blade 74a. Since the rear surface 74 h of the outward projecting edge 74 e of the exit blade 74 b is connected by the inclined plate 74 c, it is possible to prevent the granulated slag C descending underwater from accumulating on the scraper 74.
[0032]
Further, the endless chain 73 and the scraper 74 change from a state where the endless chain 73 and the scraper 74 are located above the bottom surface 63 to a state where the endless chain 73 and the scraper 74 are located along the bottom surface 63. For this reason, if the granulated slag C is slightly on the scraper 74, the endless chain 73, or the like, the granulated slag C falls when it wraps around the first sprocket 71. In this case, since the inclined cover 68 is provided above the overflow portion 61, the granulated slag C falling from the endless chain 73 and the scraper 74 passes through the inclined cover 68 and the bottom surface 63 of the first inclined portion 63 b. Will move to.
[0033]
Therefore, even if the granulated slag C is slightly accumulated on the endless chain 73, the scraper 74, etc., the granulated slag C can be prevented from falling to the overflow portion 61.
[0034]
Moreover, since the filter 84 is provided in the funnel portion 82 that receives the cooling water W flowing out from the drain pipe 81, the granulated slag C flows into the overflow section 61 together with the cooling water W, for example, and is discharged through the drain pipe 81. Even if this happens, it is possible to prevent the granulated slag C from flowing out to the drainage pipe 83 on the downstream side. Moreover, since the filter 84 is provided in the opened funnel portion 82, the recovered amount of the granulated slag C can be immediately confirmed visually, and measures such as replacement of the filter 84 can be taken quickly. There is an advantage that you can.
[0035]
Further, when each scraper 74 is sequentially moved downward by the turning movement of the endless chain 73, the outward projecting edge portion 74e of the scraping blade 74b slides on the bottom surface 63. For this reason, the entire granulated slag C descended to the bottom surface 63 moves along the bottom surface 63 and is discharged out of the water tank 6 from the slag discharge portion 62 via the second inclined portion 63c.
[0036]
During this discharge, the scraper 74 receives external forces such as a compressive load, a tensile load, and a bending load due to the movement resistance of the granulated slag C and the sliding resistance with the bottom surface 63. However, the scraper 74 has an L-shaped cross section formed by the foundation blade 74a and the scraping blade 74b, and the outer surface 74g of the rear edge 74f of the foundation blade 74a and the outward projecting edge of the scraping blade 74b. Since the rear surface 74h of 74e is welded by the inclined plate 74c and formed into a right triangular cylinder shape, the structure has a very large cross-sectional second moment. That is, even with respect to the bending load, which is the load with the greatest burden on the scraper 74, the scraper 74 has a sufficiently large rigidity and is excellent in durability. Therefore, the scraper 74 can be prevented from undergoing deformation such as bending due to the scraping operation of the granulated slag C.
[0037]
Further, each scraper 74 may receive an impact load due to a drop of the coarse slag in a state where it is positioned above the bottom surface 63 as described above. That is, the molten slag B flowing down from the melting furnace 1 may adhere to a sidewall (not shown) surrounding the periphery and solidify to become a coarse slag having a predetermined size, and the coarse slag has grown to a predetermined size. Later, it may fall into the water tank 6. However, even in such a case, since the scraper 74 has a sufficiently large bending rigidity as described above, the scraper 74 is not subjected to bending deformation due to the drop of the coarse slag.
[0038]
【The invention's effect】
As described above, according to the first and second aspects of the invention, the scraper is formed in a triangular cylinder shape by the basic blade, the scraping blade, and the inclined plate, and has a structure with a very large cross-sectional second moment. Therefore, even a bending load with the greatest burden on the scraper has sufficient strength. Therefore, it is possible to prevent the scraper from undergoing deformation such as bending due to the scraping operation of the granulated slag or the dropping of the coarse slag.
[0039]
Also, when each scraper moves upward with respect to the bottom surface, the outer surface of the foundation blade faces upward, but the rear edge of the foundation blade and the outward protruding edge of the scraping blade are inclined. Since they are connected by the plates, it is possible to prevent the granulated slag descending underwater from accumulating on the scraper.
[0040]
According to the second aspect of the present invention, the foundation blade and the scraping blade are integrally formed of angle steel, the inclined plate is formed of flat steel, and the outer surface and scraping of the rear edge of the foundation blade. Since it is connected to the rear surface of the outwardly protruding edge of the blade by welding, a scraper having excellent durability can be obtained.
[Brief description of the drawings]
FIG. 1 is an explanatory view of a main part of a slag carry-out conveyor shown as an embodiment of the present invention.
FIG. 2 is a main part explanatory view showing a portion along the bottom surface of the slag carry-out conveyor.
FIG. 3 is a perspective view of a main part of the slag carry-out conveyor.
FIG. 4 is a view showing a water tank in which the slag carry-out conveyor is installed, and is a view taken along arrow IV in FIG. 1;
FIG. 5 is a conceptual diagram showing the overall configuration of the slag carry-out conveyor, water tank, and melting furnace.
[Explanation of symbols]
6 Water tank 7 Slag discharge conveyor 62 Slag discharge part 63 Bottom face 63c 2nd inclination part (inclination part)
73 Endless chain (endless drive means)
74 Scraper 74a Foundation blade 74b Scraping blade 74c Inclined plate 74d Front edge 74e Outward projecting edge 74f Rear edge 74g Outer surface 74h Rear surface B Molten slag C Granulated slag D Movement direction

Claims (2)

An endless driving means that swivels and moves along a circular orbit, and a plurality of scrapers provided on the outer periphery of the endless driving means, and a gradient in which the water depth gradually changes in a water tank that rapidly cools the flowing molten slag to form a granulated slag. A slag carry-out conveyor configured to scrape the granulated slag descending to the bottom surface to the outside of the water tank by sequentially moving the scrapers in the shallow direction of the inclined portion along the bottom surface having a portion. ,
The scraper protrudes outward with respect to the endless driving means from the base blade connected to the outer peripheral portion of the endless driving means, and the front edge in the moving direction of the basic blade, and the endless driving means can be swung. A scraping blade having an outward projecting edge that contacts the bottom surface when moved downward along the bottom surface, a rear edge of the foundation blade in a direction opposite to the moving direction, and the scraping blade An inclined plate coupled to the outwardly projecting edge , and
The water tank includes a supply port for supplying cooling water for rapidly cooling the molten slag therein, an overflow portion for determining the height of the water surface by overflowing the cooling water, and a slag discharge located above the overflow portion. And a cover for preventing the granulated slag from falling on the overflow portion . The endless drive means is provided with a pair of two endless chains formed in an annular shape by rotatably connecting both ends of a plurality of links via pins,
It said scraper outward projection of the basal blade and the scooping blade is integrally formed by angle irons Rutotomoni, outer surface and scrape the blade of the inclined plate is formed by a flat bar rearward edge of the underlying blade It is connected to the rear surface of the edge portion by welding and is provided in plural in the turning movement direction so as to be spanned between the pair of endless chains, and each is fixed to the link. The slag carry-out conveyor according to claim 1.

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